#4. Reverse lunge
Stand with your feet hip distance apart. Hold a five- to 10-pound medicine ball with both hands with your arms outstretched in front of you. Keep your core stable, and take a large step back with your right foot, planting your foot and then lowering your body until both legs are bent in right angles. As you sink into the lunge, twist your torso to the left. Bring your torso back to center, and exhale as you straighten your legs. Bring your feet back together, and then step back on your left leg, twisting to the right. This completes one rep. Do 10 reps for a set, and do at least two sets.